Chris Rigg put pen to paper on his first professional contract at Sunderland last week. The 17-year-old earned himself a regular place in Sunderland’s first team during the second half of last season and quickly became a target for some of Europe’s biggest clubs. The likes of Bayern Munich, Man City and Liverpool were all interested in snapping Rigg up as the Black Cats awaited a decision on his future. It was then reported that the midfielder was waiting until Sunderland appointed a new head coach before deciding whether to leave the club, but it was only days into pre-season training that he…